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Fog Collector

Fog Collector

Made of

FabricRopeWoodPlastic

Brief description

A passive system for harvesting fresh water from atmospheric fog and moisture. It intercepts suspended airborne water droplets using vertical mesh panels, collecting drinking water without requiring external energy sources.

Use / Function

  • Primary use: Supplying potable water in arid or coastal regions with frequent fog.
  • Secondary uses: Irrigation for crops, reforestation support, livestock watering.
  • Scale: Domestic to community level.

Operating principle

The fog collector relies on coalescence and gravity flow:

  1. Impaction: Wind carries fog droplets against a mesh screen.
  2. Coalescence: Microscopic droplets collide with mesh filaments, merging into larger water drops.
  3. Gravity Drain: As drops grow heavier, gravity pulls them down into a drainage trough at the base of the mesh.
  4. Collection: Water flows along the trough into a storage tank or filtration unit.

How to create it

Minimum functional version

  1. Support Structure: Erect two rigid vertical poles made of Wood or metal, anchored firmly into the ground with Rope guy-lines.
  2. Mesh Panel: Stretch a fine mesh panel—such as polypropylene shade cloth or porous Fabric—perpendicular to prevailing fog-bearing winds.
  3. Collection Trough: Fix a halved Plastic pipe or wooden gutter along the bottom edge of the mesh.
  4. Storage Line: Attach a hose or pipe from the trough to a clean storage container.

Technical level

Basic. Requires basic construction skills and proper mesh positioning.

Materials needed

  • Essential materials:
    • Mesh Screen: Polypropylene mesh, fine shade cloth, or synthetic Fabric.
    • Structural Support: Wood poles or metal pipes.
    • Trough: Plastic guttering or bamboo channel.
    • Fasteners: Rope, wire, or zip ties.
  • Tools:
    • Saw, hammer, post-hole digger, level.

Variants and improvements

  • Layered Mesh: Double-layer mesh configurations increase droplet capture efficiency.
  • 3D Mesh Matrices: Rigid geometric matrices allow omnidirectional collection regardless of wind direction.
  • Hydrophobic Coatings: Surface treatments enhance droplet runoff speed, preventing blockage.

Limits and risks

  • Atmospheric Dependence: Useless without high-humidity fog or cloud cover.
  • Wind Vulnerability: Large vertical sails can tear or collapse in strong gale-force winds.
  • Contamination: Dust, bird droppings, and algae can pollute collected water; basic filtration is required before drinking.